FIELD: production of length parts, such as wires and strips, from high-temperature superconducting materials. SUBSTANCE: method involves manufacture of sheath, its filling with powdered high-temperature superconductor ceramic Bi-2223 prepared in advance and doped with lead, mechanical treatment of composition obtained followed by its annealing. Sheath is made of dispersion-strengthened alloy of silver and oxide-forming additives of following composition: Ag-Al (0.005-0.05 mass percent) - Zr (0.005-0.07 mass percent), then alloy is internally oxidized in air at 500-600 C for 60-80 h. Critical current density of superconductor strip obtained Ic= 1.104 A/sq.cm at 72 K. EFFECT: improved critical current density and stability of superconducting parameters in service. 2 tbl
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